关于安卓音乐播放器的MediaPlayer和Service联手实现播放网络音乐(只播放一首噢!!!)
首先来一个布局界面如下:
布局文件activity_main如下所示
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="vertical"
tools:context=".MainActivity">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="50dp">
<Button
android:id="@+id/start"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="开始"
android:textAllCaps="false"
android:textSize="25sp" />
<Button
android:id="@+id/pause"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="暂停"
android:textAllCaps="false"
android:textSize="25sp" />
<Button
android:id="@+id/stop"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="关闭"
android:textAllCaps="false"
android:textSize="25sp" />
</LinearLayout>
</LinearLayout>
接着MainActivity.java
package com.example.onlineplayer;
import android.app.Service;
import android.content.Intent;
import android.media.MediaPlayer;
import android.os.IBinder;
import java.io.IOException;
public class MyService extends Service {
private MediaPlayer mediaPlayer;
public static final String WEB_URL = "https://music-1253403821.cos.ap-beijing.myqcloud.com/%E8%AE%B8%E5%B5%A9%20-%20%E4%B8%83%E5%8F%B7%E5%85%AC%E5%9B%AD.mp3";
@Override
public void onDestroy() {
//当activity生命周期销毁时调用
//当播放器不为空和播放器正在播放
if (mediaPlayer != null && mediaPlayer.isPlaying()) {
//播放器停止
mediaPlayer.stop();
//停止后就被销毁了 所以需要让他准备
//在这里释放资源 优化内存
mediaPlayer.release();
mediaPlayer = null;
}
super.onDestroy();
}
@Override
public IBinder onBind(Intent intent) {
return null;
}
private void startMusic() {
mediaPlayer = new MediaPlayer();
try {
mediaPlayer.setDataSource(WEB_URL);
mediaPlayer.prepareAsync();
mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
@Override
public void onPrepared(MediaPlayer mp) {
mediaPlayer.start();
}
});
} catch (IOException e) {
e.printStackTrace();
}
}
private void pauseMusic() {
mediaPlayer.pause();
}
private void stopMusic() {
mediaPlayer.stop();
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
String action = intent.getStringExtra("action");
if ("start".equals(action)) {
startMusic();
} else if ("pause".equals(action)) {
pauseMusic();
} else if ("stop".equals(action)) {
stopMusic();
}
return super.onStartCommand(intent, flags, startId);
}
下面是Service.java
package com.example.onlineplayer;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
/***
* 演示MediaPlayer播放网络音频
*/
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
private Button start;
private Button pause;
private Button stop;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
init();
}
private void init() {
start = findViewById(R.id.start);
pause = findViewById(R.id.pause);
stop = findViewById(R.id.stop);
start.setOnClickListener(this);
pause.setOnClickListener(this);
stop.setOnClickListener(this);
}
@Override
public void onClick(View v) {
Intent intent = new Intent(this, MyService.class);
switch (v.getId()) {
case R.id.start:
intent.putExtra("action", "start");
startService(intent);
break;
case R.id.pause:
intent.putExtra("action", "pause");
startService(intent);
break;
case R.id.stop:
intent.putExtra("action", "stop");
startService(intent);
break;
}
}
}
最后在功能清单文件里注册service和网络权限
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.onlineplayer">
<uses-permission android:name="android.permission.INTERNET" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<service android:name=".MyService"/>
</application>
</manifest>